It returns: There is an error Even if I know that the link is correct, I told to the mantainers of Uniprot.org but they said that for them it's fine.

I waswondering if there is a different way from HEAD to check if a URL is working. Because actually I want to check the link and, after a while, download it. For the download I find out the FILE::FETCH module that helped me. For the URL check I can't find anything else...